| 摘要 |
A power supply circuit of a liquid crystal display is provided to prevent cross talk and short down due to a ripple signal by detecting the ripple signal included in power supplied to the liquid crystal display and removing it. A power supply unit of a liquid crystal display is composed of a ripple signal removing unit(11), a power logic unit, ripple signal removing units(13A, 13B, 13C). The ripple signal removing unit is installed at an input terminal of the power logic unit and detects the ripple signal included in an input power, and it inverts the ripple signal and combines it with the inverted ripple signal and remove a ripple component. The power logic unit receives input voltage in which the ripple is removed by the ripple removing unit and generates a power source terminal voltage, a gate low voltage, and a gate high voltage.
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